Just to be clear first of all, I am talking of OOC/Interest-Check thread opening posts, not in-character threads.
When (you) prospective players click on a link in any forum section (Free, Casual, Advanced) interested in the roleplay either based on the title or advertised setting/plot/etc, do you look to the GM's opening post for great, long, descriptions into their world, or do you prefer the OP be open and free to be more developed by the players themselves (give or take)? Should the OP really get into the knit and grit of the setting, explaining everything there is to the setting that the GM had imagined beforehand, or should the GM give a simple brief description as to the basic setting just enough that the players can understand what they're getting into without having to read a novel? Or is it in between? Should there be a few paragraphs of descriptions here and there to add more personality to the specific roleplay without trying to shove it down one's throat?
Does an ominous hider marked with (Extremely Long!) cause you to turn away and look for something else, or is it something exciting that draws you in? Would you prefer to ask questions as to specific elements that you want to know as you wish, or would you like to glean as much information from the OP's text before you come up with potential questions? Does it feel limiting to have an expansive setting spread out before you before you even join, or is it more interesting?
tl;dr I'm here wondering if players prefer not to have particularly long setting descriptions (and ask as the questions come up), or whether they like to be well-informed as to the GM's imagined world in the OP alone (they're always free to ask other questions outside the OP's descriptions). Be aware that I am taking no side here, and want to know RpG's opinions. GM's too are free to state their opinions as well, as they are just as likely to have made observations as to what other players prefer based on their own ventures into moderating/forming a roleplay.